A catch can is put in line with the vacuum line going from the pcv valve to the intake. It separates the oil(blowby) from the air. The oil goes in the can cuz it's more dense than air. There's a video on youtube where it did help the guy with OC
'06 coupe 6MT-stillen intake,exhaust, HFC's and sways/Hawk, R1/ mrev2/ JDM DD w/ pioneer
AVH-X5500BHS..... pending- plenum spacer and Osiris
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